When Cheryl and Miss Nelson are having wine after Cheryl's first day in Science Club, the amount of wine in Cheryl's glass changes between shots.
When Cheryl and George purchase the snow globe, they ask for it to be wrapped. They both walk out of the store without the gift in hand.
It's the approach to winter with snow sometimes seen on the ground, yet the deciduous trees are in full green leaf on the Science Club field trip.